Display Device Scanning Signal Line Segmentation for Delay Reduction
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Solution Overview
Problem
Large display devices using an active matrix system often experience transmission delay of scanning signals, leading to reduced display quality and non-uniformity, particularly in organic EL display devices where video data writing is impaired due to signal delay.
Innovation Solution
The implementation of multiple scanning signal lines in each pixel circuit row, with pixel circuits connected to either of the scanning signal lines, and the use of thin film transistors with specific electrode configurations to reduce signal transmission delay, including the formation of projecting portions and overlapping semiconductor layers to enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scanning signal line is used per pixel row in a large display device, then the device complexity is reduced, but transmission delay of scanning signals occurs in pixels positioned apart from the drive circuit, leading to reduced display quality
Solution Approach 1:
The scanning signal line is divided into multiple segments (first scanning signal line and second scanning signal line) that are wired in each pixel circuit row. This segmentation allows the scanning signal to be distributed through multiple parallel paths, reducing the transmission distance and delay for pixels positioned far from the drive circuit.
Solution Approach 2:
The patent introduces an additional dimension to the scanning signal line configuration by wiring multiple scanning signal lines (first and second) in each pixel circuit row. This multi-dimensional approach allows signals to reach distant pixels more efficiently by providing alternative transmission paths.
2Loss of time
If multiple scanning signal lines are wired in each pixel circuit row, then scanning signal transmission delay is reduced, but the device complexity increases
Solution Approach 1:
The pixel circuits are divided into two groups: odd-numbered pixel circuits connected to the first scanning signal line and even-numbered pixel circuits connected to the second scanning signal line. This segmentation strategy reduces the transmission delay by limiting each scanning signal line to serve only half of the pixel circuits, while the alternating connection pattern maintains manufacturing simplicity.
Solution Approach 2:
Different scanning signal lines (first and second) are assigned to different groups of pixel circuits (odd and even respectively) within the same pixel circuit row. This local differentiation optimizes signal transmission for each group while maintaining overall system manageability and reducing complexity through systematic organization.
3Loss of time
If pixel circuits are alternatively arranged on first and second scanning signal lines, then transmission delay is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The gate electrode, source electrode, and drain electrode are merged into a unified structure that spans across the region between the first and second scanning signal lines. This merging approach simplifies the manufacturing process by reducing the number of separate alignment steps required, while still achieving the benefit of reduced transmission delay through the alternative arrangement of pixel circuits.
Solution Approach 2:
The projecting portions of the scanning signal lines are positioned to overlap with the semiconductor layer in a way that creates equipotential regions, ensuring uniform electrical characteristics across different pixel circuits. This approach reduces the need for high manufacturing precision while maintaining consistent signal transmission quality.
Data Source
AI summary
The invention provides an image display device capable of reducing the transmission delay of a scanning signal. A plurality of scanning signal lines are wired in one pixel circuit row. Pixel circuits of the pixel circuit row are connected to any of the plurality of scanning signal lines.